Subject: [PATCH] IPv4: RTM_GETROUTE: Add RTA_ENCAP to result

From: Oliver Herms <[email-masked]>
Date: Thu, 12 Nov 2020 09:10:08 +0100

This patch adds an IPv4 routes encapsulation attribute
to the result of netlink RTM_GETROUTE requests
(e.g. ip route get 192.0.2.1).

Signed-off-by: Oliver Herms <[email-masked]>
---
 net/ipv4/route.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index dc2a399cd9f4..b4d3384697cb 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2872,6 +2872,9 @@ static int rt_fill_info(struct net *net, __be32 dst, __be32 src,
 	if (rt->dst.dev &&
 	    nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
 		goto nla_put_failure;
+	if (rt->dst.lwtstate && lwtunnel_fill_encap(skb, rt->dst.lwtstate,
+		RTA_ENCAP, RTA_ENCAP_TYPE) < 0)
+		goto nla_put_failure;
 #ifdef CONFIG_IP_ROUTE_CLASSID
 	if (rt->dst.tclassid &&
 	    nla_put_u32(skb, RTA_FLOW, rt->dst.tclassid))
-- 
2.25.1